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Note 6 - Construction Joint Ventures (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Condensed Balance Sheet [Table Text Block] |
|  | As of December 31, |
|  |  | 2012 |  |  |  | 2011 |
Total combined: |  |  |  |  |  |
Current assets |  | $ | 92,102 |  |  | $ | 108,458 |
Less current liabilities |  |  | (48,002 | ) |  |  | (86,023 | )
Net assets |  | $ | 44,100 |  |  | $ | 22,435 |
Backlog |  | $ | 213,924 |  |  | $ | 539,844 |
|  | As of December 31, |
|  |  | 2012 |  |  |  | 2011 |
Sterling’s noncontrolling interest in backlog |  | $ | 77,222 |  |  | $ | 127,130 |
Sterling’s receivables from and equity in net assets of construction joint ventures |  | $ | 11,005 |  |  | $ | 6,057 |
Schedule of Condensed Income Statement [Table Text Block] |
|  | Years Ended December 31, |
|  |  | 2012 |  |  |  | 2011 |  |  |  | 2010 |
Total combined: |  |  |  |  |  |  |  |  |
Revenues |  | $ | 438,756 |  |  | $ | 440,085 |  |  | $ | 302,289 |
Income before tax |  | $ | 95,765 |  |  | $ | 46,683 |  |  | $ | 24,573 |
Sterling’s noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |  |
Share of revenues |  | $ | 82,519 |  |  | $ | 62,763 |  |  | $ | 37,684 |
Share of income before tax |  | $ | 12,424 |  |  | $ | 6,417 |  |  | $ | 3,018 |

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